public class Example5_3 {
       public static void main(String args[]) {
              CheapGoods cheapGoods = new CheapGoods();
      //cheapGoods.weight=198.98; 是非法的，因为子类对象的weight变量已经是int型
              cheapGoods.newSetWeight(198);
              System.out.println("对象cheapGoods的weight的值是："+cheapGoods.weight);
              System.out.println("cheapGoods用子类新增的优惠方法计算价格："+cheapGoods.newGetprice());
              cheapGoods.oldSetWeight(198.987);
              //子类对象调用继承的方法操作隐藏的double型变量weight
              System.out.println("cheapGoods使用继承的方法（无优惠）计算价格："+cheapGoods.oldGetPrice());
       }
}
